<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
      *{
            padding: 0;
            margin: 0;
        }
        #prize{
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            top: 100px;
            display: block;
            width: 320px;
            height: 40px;
            background-color: rgb(255, 255, 255);
            border-radius: 2px;
            box-shadow: rgba(0, 0, 0, 0.3) 0 0 3px 2px;
            letter-spacing: 2px;
            text-align: center;
            line-height: 40px;
        }
        div{
            width: 330px;
            height: 330px;
            position: relative;
            left: 50%;
            top:50%;
            transform:translate(-50%,50%);
        }
        div>span{
            float: left;
            width: 100px;
            height: 100px;
            margin: 5px;
            background: rgb(22, 186, 236);
            color: white;
            text-align: center;
            line-height: 100px;
            
        }
        div>span:nth-of-type(4){
            position: relative;
            left: 220px;
        }
        div>span:nth-of-type(5){
            position: relative;
            left: 110px;
            top:110px;
        }
        div>span:nth-of-type(6){
            position: relative;
            left: -110px;
            top:110px;
        }
        div>span:nth-of-type(8){
            position: relative;
            left: -110px;
            top:-110px;
        }
        div>span:nth-of-type(9){
            cursor: pointer;
            background: rgb(255, 148, 61);
            position: relative;
            left: -110px;
            top:-110px;
        }
        div .aa{
            background: rgb(78, 78, 78);
        }
</style>
<body>
    <p id='prize'></p>
    <div>
        <span class="aa">手机</span>
        <span>平板</span>
        <span>电磁炉</span>
        <span>洗衣机</span>
        <span>衣柜</span>
        <span>冰箱</span>
        <span>电脑</span>
        <span>电视</span>
        <span>开始</span>
    </div>
</body>
</html>
<script>
       var prize= document.getElementById('prize');
    var spans = document.querySelectorAll("div>span");
        function start(){
            // if(typeof(num)=='undefined'){
            //     // spans[num].classList.remove('aa'); // 清空上一次结果
            //     console.log('hhh')
            // }
            spans.forEach(function(el,index){
                if(index!=0){
                    el.classList.remove('aa'); // 清空上一次结果
                }
            })
            prize.textContent='';   
            spans[8].style.cursor="not-allowed";
            spans[8].onclick=null;
            let num=-1;      //奖品序号
            let times=parseInt(Math.random()*(30-18+1)+18,10);
            let time=0;     //当前的旋转次数
            let speed=100;  //转盘速度
                timer = setInterval(function(){
                num++;
                time++;
                if(num > 7){
                    num = 0;
                    spans[0].classList.add('aa');
                    spans[7].classList.remove('aa');
                }else if(num==0){
                    spans[num].classList.add('aa');
                    spans[7].classList.remove('aa');
                }else{
                    spans[num].classList.add('aa');
                    spans[num-1].classList.remove('aa');
                } 
                if(time>times){
                    spans[8].onclick=start;
                    spans[8].style.cursor="pointer";
                    clearInterval(timer);
                    prize.textContent='恭喜您抽中了'+spans[num].textContent+'!!!';
                }
            },speed)
        }
    spans[8].onclick=start;
</script>